Display screen with a graphical user interface



FIG. 1 illustrates a front view of a display screen or portion thereof with a graphical user interface;

FIG. 2 shows a second embodiment thereof;

FIG. 3 shows a third embodiment thereof;

FIG. 4 shows a fourth embodiment thereof;

FIG. 5 shows a fifth embodiment thereof; and,

FIG. 6 shows a sixth embodiment thereof.

In FIGS. 1-6, the broken lines showing the display screen form no part of the claimed design. The remaining broken lines showing portions of the graphical user interface form no part of the claimed design. 

CLAIM The ornamental design for a display screen with a graphical user interface, as shown and described. 